I have this problem too. I haven't solved it, but one thing that has helped is setting an alarm and not looking at the time while sleeping. If you wake up at anytime during the night, go back to sleep without looking at a clock. Don't get out of bed until your alarm goes off.
After a while of waking up too early, it got to the point of waking up at 4am and thinking "that's close enough" and I would get out of bed. (Attempting) to go back to sleep regardless of the time seems to have helped that a bit.
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I have this problem too. I haven't solved it, but one thing that has helped is setting an alarm and not looking at the time while sleeping. If you wake up at anytime during the night, go back to sleep without looking at a clock. Don't get out of bed until your alarm goes off.
After a while of waking up too early, it got to the point of waking up at 4am and thinking "that's close enough" and I would get out of bed. (Attempting) to go back to sleep regardless of the time seems to have helped that a bit.